Revert "Revert "V0.4.0 imporve error response""

This reverts commit 9744f45e86.

backend/model/node.go

@@ -1,7 +1,9 @@
 package model
 
 import (
+	"crawlab/constants"
 	"crawlab/database"
+	"crawlab/services/register"
 	"github.com/apex/log"
 	"github.com/globalsign/mgo"
 	"github.com/globalsign/mgo/bson"
@@ -79,6 +81,7 @@ func GetNodeList(filter interface{}) ([]Node, error) {
 
 	var results []Node
 	if err := c.Find(filter).All(&results); err != nil {
+		log.Error("get node list error: " + err.Error())
 		debug.PrintStack()
 		return results, err
 	}
@@ -153,3 +156,47 @@ func GetNodeCount(query interface{}) (int, error) {
 
 	return count, nil
 }
+
+// 节点基本信息
+func GetNodeBaseInfo() (ip string, mac string, key string, error error) {
+	ip, err := register.GetRegister().GetIp()
+	if err != nil {
+		debug.PrintStack()
+		return "", "", "", err
+	}
+
+	mac, err = register.GetRegister().GetMac()
+	if err != nil {
+		debug.PrintStack()
+		return "", "", "", err
+	}
+
+	key, err = register.GetRegister().GetKey()
+	if err != nil {
+		debug.PrintStack()
+		return "", "", "", err
+	}
+	return ip, mac, key, nil
+}
+
+// 根据redis的key值，重置node节点为offline
+func ResetNodeStatusToOffline(list []string) {
+	nodes, _ := GetNodeList(nil)
+	for _, node := range nodes {
+		hasNode := false
+		for _, key := range list {
+			if key == node.Key {
+				hasNode = true
+				break
+			}
+		}
+		if !hasNode || node.Status == "" {
+			node.Status = constants.StatusOffline
+			if err := node.Save(); err != nil {
+				log.Errorf(err.Error())
+				return
+			}
+			continue
+		}
+	}
+}